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Abstract The top-quark mass is measured in the all-hadronic top-antitop quark decay channel using proton-proton collisions at a centre-of-mass energy of s = 8 $$ \sqrt{s}=8 $$ TeV with the ATLAS detector at the CERN Large Hadron Collider. The data set used in the analysis corresponds to an integrated luminosity of 20.2 fb−1. The large multi-jet background is modelled using a data-driven...

Detailed measurements of t-channel single top-quark production are presented. They use 20.2 fb $$^{-1}$$ - 1 of data collected by the ATLAS experiment in proton–proton collisions at a centre-of-mass energy of 8 TeV at the LHC. Total, fiducial and differential cross-sections are measured for both top-quark and top-antiquark production. The fiducial cross-section is measured with a precision...

The reconstruction of the signal from hadrons and jets emerging from the proton–proton collisions at the Large Hadron Collider (LHC) and entering the ATLAS calorimeters is based on a three-dimensional topological clustering of individual calorimeter cell signals. The cluster formation follows cell signal-significance patterns generated by electromagnetic and hadronic showers. In this, the clustering...

Measurements of the production cross section of a $$Z$$ Z boson in association with jets in proton–proton collisions at $$\sqrt{s} = 13$$ s = 13 TeV are presented, using data corresponding to an integrated luminosity of 3.16 fb $$^{-1}$$ - 1 collected by the ATLAS experiment at the CERN Large Hadron Collider in 2015. Inclusive and differential cross sections are...

This paper presents the method and performance of primary vertex reconstruction in proton–proton collision data recorded by the ATLAS experiment during Run 1 of the LHC. The studies presented focus on data taken during 2012 at a centre-of-mass energy of $$\sqrt{s} = 8$$ s = 8 TeV. The performance has been measured as a function of the number of interactions per bunch crossing over a wide...

During 2015 the ATLAS experiment recorded $$3.8\,{\mathrm{fb}}^{-1}$$ 3.8 fb - 1 of proton–proton collision data at a centre-of-mass energy of $$13\,{\mathrm{TeV}}$$ 13 TeV . The ATLAS trigger system is a crucial component of the experiment, responsible for selecting events of interest at a recording rate of approximately 1 kHz from up to 40 MHz of collisions. This paper...

This article presents measurements of $$t\bar{t}$$ t t ¯ differential cross-sections in a fiducial phase-space region, using an integrated luminosity of 3.2 fb $$^{-1}$$ - 1 of proton–proton data at a centre-of-mass energy of $$\sqrt{s} = 13$$ s = 13 TeV recorded by the ATLAS experiment at the LHC in 2015. Differential cross-sections are measured as a function...

The dynamics of isolated-photon plus one-, two- and three-jet production in pp collisions at a centre-of-mass energy of 8 TeV are studied with the ATLAS detector at the LHC using a data set with an integrated luminosity of 20.2 fb-1. Measurements of isolated-photon plus jets cross sections are presented as functions of the photon and jet transverse momenta. The cross sections as functions of the azimuthal...

This paper presents a measurement of the polarisation of W bosons from $$t\bar{t}$$ t t ¯ decays, reconstructed in events with one high- $$p_{\text{ T }}$$ p T lepton and at least four jets. Data from pp collisions at the LHC were collected at $$\sqrt{s}$$ s = 8 TeV and correspond to an integrated luminosity of 20.2 fb $$^{-1}$$ - 1 . The angle...

Abstract To probe the W tb vertex structure, top-quark and W -boson polarisation observables are measured from t-channel single-top-quark events produced in proton-proton collisions at a centre-of-mass energy of 8 TeV. The dataset corresponds to an integrated luminosity of 20.2 fb−1, recorded with the ATLAS detector at the LHC. Selected events contain one isolated electron or muon, large missing...

Abstract A measurement of the t-channel single-top-quark and single-top-antiquark production cross-sections in the lepton+jets channel is presented, using 3.2 fb−1 of proton-proton collision data at a centre-of-mass energy of 13 TeV, recorded with the ATLAS detector at the LHC in 2015. Events are selected by requiring one charged lepton (electron or muon), missing transverse momentum, and two jets...

The reconstruction and calibration algorithms used to calculate missing transverse momentum ( $$E_{\text {T}}^{\text {miss}}$$ E T miss ) with the ATLAS detector exploit energy deposits in the calorimeter and tracks reconstructed in the inner detector as well as the muon spectrometer. Various strategies are used to suppress effects arising from additional proton–proton interactions, called...

Measurements of jet activity in top-quark pair events produced in proton–proton collisions are presented, using 3.2 fb $$^{-1}$$ - 1 of pp collision data at a centre-of-mass energy of 13 TeV collected by the ATLAS experiment at the Large Hadron Collider. Events are chosen by requiring an opposite-charge $$e\mu $$ e μ pair and two b-tagged jets in the final state. The normalised...

This paper describes the algorithms for the reconstruction and identification of electrons in the central region of the ATLAS detector at the Large Hadron Collider (LHC). These algorithms were used for all ATLAS results with electrons in the final state that are based on the 2012 pp collision data produced by the LHC at $$\sqrt{\mathrm {s}}$$ s = 8 $$\text {TeV}$$ TeV . The efficiency...

Abstract Measurements of top quark spin observables in t t ¯ $$ t\overline{t} $$ events are presented based on 20.2 fb−1 of s = 8 $$ \sqrt{s}=8 $$ TeV proton-proton collisions recorded with the ATLAS detector at the LHC. The analysis is performed in the dilepton final state, characterised by the presence of two isolated leptons (electrons or muons). There are 15 observables,...

Two searches for new phenomena in final states containing a same-flavour opposite-sign lepton (electron or muon) pair, jets, and large missing transverse momentum are presented. These searches make use of proton–proton collision data, collected during 2015 and 2016 at a centre-of-mass energy $$\sqrt{s}=13$$ s = 13 $$\text {TeV}$$ TeV by the ATLAS detector at the large hadron...

Abstract Ratios of top-quark pair to Z-boson cross sections measured from proton-proton collisions at the LHC centre-of-mass energies of s = 13 $$ \sqrt{s}=13 $$ TeV, 8 TeV, and 7 TeV are presented by the ATLAS Collaboration. Single ratios, at a given s $$ \sqrt{s} $$ for the two processes and at different s $$ \sqrt{s} $$ for each process, as well as double ratios...

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